Toob Flanger, Stereo Reverb, bug fixes

- support state in factory presets.
- Use uncompressed json for settings files.
- Set current plugin preset name to last loaded plugin preset.
- Append plugins after  start node,  before end node fixed.
- Correctly release web socket when web app goes idle.
- Fit and finish issues.

src/WebServer.cpp

@@ -261,7 +261,7 @@ namespace pipedal
                 this->socketHandler = nullptr;
                 webSocket = nullptr;
                 pServer = nullptr;
-                Lv2Log::info("WebSocketSession closed.");
+                Lv2Log::info(SS("WebSocketSession closed. " << fromAddress));
             }
             using ptr = std::shared_ptr<WebSocketSession>;
             WebSocketSession(WebServerImpl *pServer, server::connection_ptr &webSocket)